Answer:Plants pull carbon dioxide out of the air through photosynthesis. Photosynthesis requires atmospheric carbon, while cellular respiration returns carbon to the atmosphere, and vice versa for oxygen. Another way that cellular respiration releases carbon into the atmosphere is through the actions of decomposers. Decomposers derive their nutrients by feeding on the remains of plants and animals. The bacteria and fungi use cellular respiration to extract the energy contained in the chemical bonds of the decomposing organic matter, and so release carbon dioxide into the atmosphere.
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